Azo coloring-matter.



UNITE earns PATENT orrron.-

ARTHUR ZART, OF VOHWINKEL, NEAR ELBERFELD, GERMANY, ASSIGNOR TO FARBEN- i FABRIKEN VORM. FRIEDRBAYER & 00., OF ELBERFELD, GERMANY, A CORPORA- TION 0F GERMANY.

Azo COLORING-MATTER.

Patented Apr. 2, 1912.

No Drawing. Application filed June 6, 1911, Serial No. 631.552. Renewed February 7, 1912. Serial No,

To all whom it may concern:

Be it known that l, Au'rnuu Zau'r, doctor of philosophy, chemist, citizen of the German Empire, residing at Volnvinkcl. near Elberfeld, Germany, have invented new and useful Improvements in Azo Coloring-Matter, of which the following is a specification.

My invention relates to the manufacture and production of new coloring matters having most probably the Formula:

R- meaning an arylearbonyl-2amino-5-naphthol-7sulfonic acid, such as bcnzoylor para anisoyl-Q-an1ino-5-naplnthol-T-sulfonic acid, etc. The new dyes are obta ined by combining one molecule of diazotized Zaminoarylcarbonylamino-oaiaphthol-T-sul'tonic acid with the 5.5-dioXy-2.2-dinaphthylamin-7.7-disulfonic acid.

The new dyes are after being dried and .pulverized in the shape of their alkaline sulfonic acid are diazotized with 69 parts or sodium nitrite and hydrochloric acid and the resulting diazo compound is combined with a solution of 461 parts of 5.5-dioxy- 2.2 dinaphthylamin-7.7'-disultonic acid:

containing an excess of sodium bicarbonate. When the combination is complete the disazo dye is salted out. It is after being dried and pulverized in the shape of its sodium salt a dark powder, soluble in water with a bluish-red color and soluble in concentrated sulfonic acid with a bluish-red color. By reduction with stannous chlorid and hydrochloric acid the dye is decomposed, Q-para-aminobcnzoylamino-B-naphtholT-sult'4.mic acid and the 5.5-dio.\'y-( amino 2.2 t'linaphthylamin 7.T-disulfonic acid are obtained. It dyes cotton bluishred shades, changing into a fast Bordeaux by development with diazotized para-nitranilin. The shade thus obtained is fast to washing and can be discharged to a pure white with hydrosullitc.

The monoazo dye obtained from 2-metaaminobenzoylamino-5-naphthol -T- sulfonic acid dyes cotton red yielding a bluish-red by developing the dyed liber with diazotized para-nitranilin. ()n using meta-aminopara anisoyl -2-amino-5-naphlhol-T-sulfonie acid somewhat more bluish shades are oblained.

I claim 1. The herein described new monoazo dyestuffs having, most probably the formula Y-suli'onie acid, which are after being dried and pulverized 1n the shape of their alkaline salts dark powders easily soluble in I I l l l R meaning i i-benzoylamino-fidlaphtlwl-i z0y1amin0-5-naphtho1-7 -si11fonic acid and sulfonic acid, which is after being dried development with diazotized para-nitranilin and pulvcrizedin the shape of its sodium which are fast to washing and canbe dissalt a dark powder, soluble in water with a charged to a pure white with hydrosulfite, bluish-red color and soluble in concentrated substantially as describe sulfuric acid with a bluish-red color; yield- In testimony whereof I have hereunto set ing 11 on reduction with stannous chlorid' my hand in the presenceof two subscribing and 'ydrochloric acid 2-para-amino-benwitnesses.

ARTHUR ZABT. [1... s.]

5.5- dioxy 6 amino 2.2 dinaphthylamin- Witnesses: 7.7'-disu1fonic acid; dyeing cotton bluish-red ALFRED HENKEL, shades, changing into a fast Bordeaux by ALBERT F. NEEFER. 

